Pathway and products of CO2-fixation by green prokaryotic algae in the cloacal cavity of Diplosoma virens |
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Authors: | T Akazawa E H Newcomb C B Osmond |
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Institution: | (1) Research Institute for Biochemical Regulation, School of Agriculture, Nagoya University, Chikusa, Nagoya, Japan;(2) Department of Botany, University of Wisconsin-Madison, Madison, Wisconsin, USA;(3) Department of Environmental Biology, Research School of Biological Sciences, Australian National University, Canberra City, A.C.T., Australia |
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Abstract: | Light-dependent 14CO2 fixation by the algae of Diplosoma virens (Hartmeyer) ranged between about 3 and 27 moles mg-1 chlorophyll h-1. The principal first products of 14C fixation were 3-phosphoglyceric acid and phosphorylated sugars, indicating that ribulose bisphosphate carboxylase was the primary carboxylation enzyme. The activity of this enzyme in crude extracts of the algae was 4 to 6 moles CO2 mg-1 chlorophyll h-1. The principal end product of 14C fixation by these algae in the ascidian host was a water-soluble oligosaccharide which was an -1,4-glucan. A maximum of 7% of the 14C fixed was found in insoluble materials of the algae or its host after 60 min 14CO2 fixation. Whether the -1,4-glucan is a product of algal or animal metabolism remains to be determined. |
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